Method of shrinking bull-rings on pistons.



T. ROGAICHOFF.

METHOD OF SHRINKING BULL RINGS 0N PISTONS.

APPLICATION FILED DEC. 9, 1918.

Patented Dec. 30,1919.

Suva/14430;

rrrnononn noenrcnorr, or BALTIMORE, MARYLAND.

METHOD OF SHRINKING BULL-RINGS N PISTONS.

Specification of Letters Patent.

Patented Dec. 30, 1919,

Application filed December 9, 1918. Serial No. 265,952.

To all whom it may concern:

Be it known that I, THEODORE ROGATCHOFF,

a citizen of the Republic of Russia, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Methods of Shrinking Bull-Rings on Pistons, of which the following is a specification, reference being bad therein to the accompanying drawing.

This invention relates to new and useful improvements ina method of shrinking bull rings upon the circumferences of pistons, and comprises means whereby old and worn pistons may be reconstructed and their usefulness appreciably prolonged at a MIDI- mum of cost.

My invention is illustrated in the accompanying drawings which, withthe numerals of reference marked thereon, form a part of this application and in which:

Figure 1 is a sectional view through a worn piston adapted to be circumferentially dressed for the reception of the bull ring, as shown in dotted lines.

Fig. 2 is an enlarged detail sectional view of a portion of the iston as it would appear after being trimmed to receive the bull ring.

Fig. 3 is an enlarged detail sectional View through a piston, parts being broken away and showing the bull ring as applied thereto. Fig. 4c is a sectional View on lme 1-4: of

Fig. 3.. i

ig. 5 is a sectional v1ewvertically through a modified form of piston, showlng auxiliary means for holding the bull ring in place, and

Fig. *6 is a sectional view of a portion of the piston and bull .ring positioned as the parts would appear before the bull mug is shrunken in place. 1

Reference now being had to the-details of the drawings by numerals:

1 designates a piston of conventional type mounted upon a piston rod 2 and provided with circumferential packing rings 3 seated in ooves provided for their reception and which piston is adapted to be circumferentially cut away along angular dotted lines designated by arrows in Fig. 1 of the drawings, leaving a finished circumference, as indicated in Fig. 2 of the drawings, which circumference is provided along one face with a flange 4 having an inclined edge 5, and a shoulder 6 near the opposite face, each provided for an essential purpose in successfully carrying out the method which is provided for shrinking on bull rings.

The hull ring is designated in the drawings by numeral 7 and has an inclined ortion 8 adapted to conform to the inclmed edge 5 of said flange 4, and also a shoulder tact with the inclined surface 5 of the flange,

which is cold, the bull ring will be given a slight movement toward the shoulder 6, and

I as the inner periphery of the bull ring contacts with the circumference of the piston, the shoulders 6 and 9 will interlock and be shrunken together under tremendous pressure, thus securely locking the bull ring in place. As an extra precaution in holding the bull ring in place, registering holes, designated respectively by numerals 10 and 11, are formed one in the periphery of the bull ring, as shown in Fig. 4 of the drawings,

and the other in the wall of the piston, and

in which registering holes screws 12, as shown in Fig. 3 of the drawings, may be-inserted, and when adjusted in lace a packing rin 3 inserted in the annu ar recess will cover t e outer ends of the screws. In Figs.

5 and 6 ofthedrawings I have shown a slight modification of -my invention in which, instead of screws, .plugs 13 are v 9 adapted to be shrunken against the shoulmounted in registerin holes, one designated by numeral 14 and ormed in the wall of the piston, and the other 10" in the inner periphery of the bull rin After the'bull ring has been shrunken an the plugs inserted, a piece of welding material 13 may close the opening in the end of the hole in the wall of the piston, as shown in Fig. 5 of the drawings. By the provision of this method of shrinkmg bull ringsupon pistons, as shown and described, it will be noted that a secure means is afforded for holding the same in place and at the same time affordin a means for utilizing worn pistons by t dressing the circumference thereof and then applying the bull ring in the manner set forth. By this method the usefulness of the piston is appreciably prolonged and at a minimum of expense.

What I claim to be new is:

A method of applying bull rings to pistons, consisting of expanding by heat a bull ring having lnelined and shouldered portions in its periphery and placingthe same about a piston, having circumferential inclined and shouldered portions corresponding to said inclined and shouldered portions upon the bull ring, the inclined surfaces of the two elements causing the bull ring to move slightly laterally as it shrinks, thereby forcing the shoulders tightly together.

In testimony whereof I hereunto affix my signature in presence of a witness.

THEODORE ROGATCHOFF. Witness:

A. L. House. 

